Setting this option to YES will cause StarSQL to attempt to establish a "Trusted Connection". That connection can then be used to switch between active User Ids, optionally using "Identity Propagation".
Currently, this option is supported only for connections to DB2 for z/OS (v9 and later); contact StarQuest support if you plan to use this option for connections to DB2 for LUW.
See the technical note Using TrustedConnection and Identity Propagation for further details.